Compound pump.



J. DESMOND.

COMPOUND PUMP.

APPLIUATION FILED APR. 9, 190a. RENEWED NOV.6,1908.

Patented Jan. 12, 1909.

v 1221672701"- M25) I W To all whom 'it may concern.-

factured and whic construction, combinations and arrange trated in the accompanying drawing and cylinder 10 and a small high pressure cylininto a cap taken a'art for re airs and the-like.

I which: the following is declared to be a full,

clear, and exact description.

I the kc, and seeks to provide a-simple conwith one-way yielding, oppositely-acting,

and the lower end' of the large cv der is let.

f properly.

cylinders 10 and 11 are formed of pieces of nnstm rns PATENT OFFICE.

mm nnsnonn; or CHICAGQILLINOIS, issrcxon TO ARTIZAN BRASS COMPANY, or

' -cHIcAco', ILLINOIS, A CORPORATION.

I COMPOUND rum.

Specification 0: Letters Patent.

Patented Jan. 12, 1909.

Renewed. November 6, 1908. Serial No. 461,382.

Be it known that I, JOHN DESMOND, a

- citizen of the United'States, and a resident" of Chicago, county of Cook-, and State of Illi-' nois, have invented certain new and useful Improvements in Compound Pumps, of

- Theim rovernent relates to smallportable com oun pumps for automobile tires and struction which ma 'be inexpensively manu may be readily taken apart for repairs and the like.

The invention consists in the features ofm'ents of parts hereinafter set forth,- illusmore particularly pointed out in the appended claims. I

In the drawings Figure l is a view in longitudinal section of the im roved pump. Figs.- 2 and 3 are sections on es 2-2 and 3 -3 es ectively of Fig. 1.

- lhe pump comprises a large low pressure 1 der 11 arranged side by s1de and provided on -l'eathers or pistons 12 and -13. The cy ders communicate at .their up er ends provided with an inlet, while the lower end of the small cylinder is provided with an outa The piston rods 14 and 15 are connect ed to and are simultaneously operated by a common handle 16. In pumps of this sort the ends'of the cylinders are usuall threaded and foot pieces. Suc mode of construction is defective, the'parts cannot be easily assembled. nor can they be readily t is highly esirable t at the parts of such a um can be readily disconnected since the exi lelcup-leathers or pistons often become dry'so that hey willnot work.

- ard and In the present improved construction, the

plain metal tubing (preferably of brass) out to proper length and arranged in contact side by side. The ends of the cylinders are unthreaded but snugly fit within and are brazed to a base or footipiece l7 and a flange member 18. The foot piece 17 is of cast portion 19 so that the pump will besecurely eld in upright position by the operators' foot. The .base piece is provided with an upstandin flange 20 shaped to snugly fit a out the lower ends of the cylinders and the lower ends. of. these cylinders are thereto.

The foot piece is provided with an inlet or i orifice 21 opening into the lower end of the large low pressure cylinder.- Thefoot piece has a boss 22 atone side having a bore or discharge outlet 23 leading from the lower end of the-small high pressure cylinder 11. An

upstanding nipple 24 communicates with the bore 23 and is arran ed to receive the end of the flexible tube '25 y which the pump may 1 be placed in communication with the tire or the like. A portion of the bore 2.3 is enlarged and a seat for a ball valve 26 is formed between the enlarged and contracted portions of such boreor outlet. A plug 27 is removably threaded within the outer end of the bore and is provided at its outer end with a head or flange28 that abuts against the end of the boss 22 to prevent leaking at this point. A coiled spnn 29 arranged between the plug 2-7 and the va ve 26, holds the latter ieldingly against its seat and prevents anyack flow from the tube 25.

The flange member 18 is formed of cast metal and s shaped to-fit snugly about the upper ends of the cylinders 10 and 11. The latter are placed within the fiange member .with their upper edges in line with the upper to" laced .within the flange 20 and securely razed face thereof and are securelv brazed to the member. After the cylinders have been brazed within the flange member '18 the upper edges thereof and the upper face of the flange member are planed so that they present a smooth, flat surface. A packing strip 30 of suitable material and a cap plate 31 of castm-etal, are provided. The packing strip 7 and cap plate correspond in outline to the flange member 18 and are secured in place over the upper ends of the cylinders, with the packing strip between the flange member 18 and cap plate 31, by screws 32 extending through ears 33 and 34, that are correspondingly formed upon the cap plate and flange member. The lower face of the cap plate 31 is planed to present a true, flat surface and the headed screws 32 extend loosely through the ears 33 of the cap plate and are threaded 55 metal and, asshcwn,isprovidedwithatread'1 into the ears'34 of the flange member 18.

' the down stroke of thepistonis hmited by cylinders in communication; Thiscom- Two sets of the ears 33 and 34 through which the connectirg screws 32 extend, are arra ged at opposite ends of the cap plate 31 and age member 18, and two sets are arranged intermediate the'ends of these parts at points between the cylinders, as shown in Figs. 2 ande3. By this arrangement the cap plate 31 may be ea ily secured in position or removed when-desired. But when in posi: tion, will effectively prevent leaking around the upper ends of the cylinders.

The piston rods Hand 15 extend upwardly through openings in the packing strip 30'and the cap plate 3.1, and the latter are-provided with suit able stufling boxes 35 having glands 36 that surround the rods. The packing strip 30 between the piston rods, is cut away as at 37 (see Fig. 3) and the cap plate 31 is provided on its'under face with a channel or groove 38- that places the'upper ends of the municating port or paage in prior .constructions has been formed in the walls of the cylinders, but when so arranged its edges are apt to cut and wear the cup-leathersor pistons.

The lowpressure cup-leather-or' piston 12- is upturned While the high cupleather 13 is downturned, as s own. These cup-leathers or pistons are held inplaeenpon the lower reduced ends of the piston rods 14 and 15 between plates or washers 39, by nuts 40 threaded thereon. The pistons are arranged opposite each other, as shown, and the upward movement thereof is arrested byengagement of the upper plate 39 ofthe high pressure piston with the cap-plate 31, and

the engagement of the-lower plate or washer 39 of the low pressure piston with the foot piece 17. These parts are so arranged that the yielding edge of the cup-leather 12 .may closely approach the cap plate 31 and the edge of the downturned cup-leather 13 may closely approach the foot piece 17, but without being jammed against these parts. The upper reduced ends of the piston rods 14 and 15 extend throu h the central portion of the cross bar or han e 16 and are secured thereto by nuts 41. The opposite ends of the cross bar are provided with gripping portions 42 and the rods, as shown, are connected to the handle bar at equal distance from its ends, so that the pressure will be uniformly applied to the rods and pistons without side strain thereon.

The operation will be readily understood. On the down stroke air will be drawn in through the'inlet 21, past the low pressure piston 12 and into both of the cylinders. On the up stroke piston 12 will expand and-@ snugly engage the wall of the large piston 10' and will compress the air in both cylinders 2 past the yielding high pressure piston and 1 andsmallcy 'stantially as described.

I scenes into the lower end of the small high pressure cylinder. On the next down stroke, the high pressure piston 13 will expand and snuggnengage the walls of its cylinder 11 and ally com ress the air beneath it out' through the disc 'arge outlet 23 and past the check valve 26 therein to the nipple 24, pipe 25 and tire to. which the latter is connected. At the same time the cylinders are again filled with air.

. Theimprove'd construction described may be inexpensively manufactured. The parts can be readily assembled and should the cupleathers become hard and dry, misshapen or worn out so that the ump does not operate properly, they may be readily repaired or renewed by removing the screws 32 and cap plate 31 and the parts then quickly and readily assembled.

It is obvious thatthe details set forth may be varied without departure from the essentials of the. invention.

Having described. my invention, what I claim as new and desire to secure by- Letters Patent is:--

1 1. A com und ump comprising large ders. ormed oftubing and arranged side by side, a cast metal foot piece fittingupon and bra'zedto the lower ends of said cylinders, a flange'member fitting over andbrazed to the. upper ends of said cylinders, a cap plate 1'1 nsaid e member, an intermediate pac strip plate and mem r, screwsdetachably connec said and cap plate, oneway yiel oppositely-acting pistons in said cylin throu h said cap plate and a common handle to WhlCh the upper ends of said rods are con"v nected, said cap plate having stuflin boxes about said piston rods, and a channe on its under face'communicating with said cylin ders, and said foot piece having an inlet opening into the large cylinder and a valved outlet eading from the small cylinder, sub- 2. A compplund pump comprising large and small cy ders formed of tubing and arranged in contact side by side, a cast metal foot piece fitted upon and brazed to the lower ends of said cylinders, a flange member fitting over and brazed to the upper ends of said cylinders, a cap plateupon said flange member and an intermediate packing strip between said plate and flange member, screws detachablyconnecting said parts, one-way yielding, oppositely-acting pistons in said cylinders having piston rods extend ing through said cap plate, a common handle to which the upper ends of said rods are connected, said cylinders communicating at their upper endsand having an inlet and stantially as described.

ders havlng piston rods extending tween said said cylinders, a flange memberfitting over shaped packing strip'bet-ween said plate and flange member, screws detachably connectdershavmg piston rods extending through acap plate and a cross bar or handle to whichtant fromthe end thereof, said cap plate ber fitting over and brazed to the upper ends 3. A compound pump comprising large and small cylinders formed of tubing and arranged in contact side by side, a cast metal foot piece having an upturning flange within which the lower ends of said cylinders fit and g whereto they are brazed, a flange member I fitting over azrl brazed to the upper ends of said cylinders, a cap plate corresponding in l outline to and-mounted upon said flange member, an intermediate correspondingly i ing said parts and extending loosely through the perforated ears in said cap plate and i threaded into corresponding. ears in said flange member, one-way yielding, oppositely-acting pistons in said iiylinders having piston rods extending through said cap plate and a common handle to which the upper ends of said rods are connected, said cylin ders communicating at their upper ends and having an inlet and an outlet at their lower ends respectively, substantially as described. 4. A compound pump comprising large and small cylinders formed of tubing and ar-' ranged side by side, a cast metal 'foot piece fitting'upon and brazed to the lower ends of and brazed to the upper ends of said cylinders, a cap plate upon said .flange member, an intermediate packing strip between said parts, screws detachabl connecting said ange member and cap p ate, one-vva. yielding, oppositely-acting pistons in sai cylinsald rods are connected at points equally dishaving stufiing boxes about said piston rodsand a channel on its under face communicating with said cylinders, and said foot piece having an inlet opening into'the large cylin der and a valve outlet leading from the small cylinder, substantially as described;

5. A componund ump comprising large and small cy ders ormed of tubing and arranged'in contact side by side, a cast metal footiece having an upstanding flange within w 'ch the lower en of said cvlinders fit and Whereto they are brazed, a flange memof said cylinders, a ca plate upon said flange member, an interme 'ate packing strip between said plate and 'flangea member, screws detachably connecting said flange and cap plate, one-way yielding, oppositely-acting 3 pistons in said cylinders having piston rods extending through said cap plate and a .common handle to which the upper ends of said rods are connected, said cap plate having stufiing boxes about said piston rods and a channel on its under face communicating; with said cylinders and said foot piece hav- 'i ing an inlet opening intothe large-cylinder l and a coiled spring between said plug and valve, substantially as described.

6. -A compound pumpv comprising large and sm'all'cylinders formed of tubing, arranged side by side and secured together at their lower ends, a flange member fitting over and brazed to the upper ends of both of said cylinders, a cap plate-extending over the ends of both of said cylinders and over said flange member, an intermediate, packing strip between said plate and said flange member and screws detachably connecting said parts, one way yielding, oppositelyacting pistons in saidcylinders having piston rods. extending through said cap plate, a common handleto which-the upper ends of said rods are connected-said cap plate'having 'stulfing boxes about said piston rods, and said cylinderscommunicating at their upper endsand having an inlet and outlet at their lower-ends respectively, substantially as described.

7-. A compound pump comprising relatively large and small cylinders formed of tubing and arranged side .byside, a metal piece flttiu u )on and secured to-the lower ends of bot ot said cylinders, a flange member fitting over and secured to the upper ends of both of saidcylinders, a commoncap plate extending overthe upper ends of said cylinders and over said flange member, an intermediate packingstrip between said plate and flange member, screws detachably connecting saidplate and flange member, one way yielding, oppositely acting pistons in said cylinders having piston rods extending through said cap plate, and a common handle to which the upper ends, of said rods are connected, said cap plate having stufiing boxes about said iston rods, the metal piece'secured to-the ower ends of said cylinders having an inlet opening into the large cvlinder and a valved outlet leading from the small cylinder, and said cylinders communicating at their upper ends, substantially as described.

8. A compound pump comprising relatively large and small cvlinders formed of tubing and'arranged side by side, .a cast metal piece fitted upon and brazed to the lower endsof both of said cylinders, a flange mem ,ber fitted overand brazed to the upper ends of both ofsaid cylinders,- a: common cap plate extending over the outer ends of said -j cylinders and over said flange member, an

intermediate packing strip between said parts, one way ylelding, oppos tely acting pistons in saidcylinders having piston rods extending through said cap plate, and a common handle to which the u per ends of I from-the small cylinder, substantially as desaid rods are connected. Islaid o inders hav scribed.

ing a communication at t eir upper ends ate 1 T T point between the adjacent edgeportions JOEL D 5 thereof and said cap-platefa-nd said cast 'Yvitnessesz metal piece having an inlet opening into the LILLLAN PRESTIGE,

large OYlllldGl and a. valved outlet leading V v KATHARINE GERLACH. 

